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Thread: Algaecide Overdose

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    Join Date
    Aug 2015
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    Middletown, NJ
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    Algaecide Overdose

    Hi,
    After having been freaked out by the sight of my dog with a dead animal in its mouth, I accidentally put about 18 oz of algaecide in my pool instead of muriatic acid. Problem is I had added about 22 oz of algaecide yesterday as a preventive dose. (My pool company had added algaecide when I opened my pool on 4/29 and I have not had any problems. Yesterday is the first time I added algaecide myself.) Earlier today, I added about 66 oz of 8.3% bleach to get chlorine levels up. After I lowering the pH with the muriatic acid, I had planned to add about 4 pounds of CYA because my chlorine seems to be burning off more quickly now that it has gotten sunnier/warmer.

    Will the extra algaecide cause any harm? Do I have to wait to add muriatic acid? If so, how long? How long after adding muriatic acid can I add the CYA (plan to put it in a sock in the skimmer). How long after adding CYA can we swim? Does the CYA need to be fully dissolved before we swim?

    Sorry for all the questions. I thought I was getting the hang of this.

    Thanks,
    Laura

    Today’s Test Result (before any chemicals were added)
    FC 1.5
    CC 0.5
    TC 2.0
    TA 80-90
    CH 250 ppm
    CYA 25
    pH 7.7
    20K gal, IG fiberglass installed 8/25/15, Pentair Intelliflo 3 HP variable speed pump, Pentair FNS Plus 48sf DE filter, Pentair Intellichlor IC-40 SWG, Aqua Comfort ACT-1250 Heat Pump, 3 S.R. Smith Pal Treo Lights with WPC1, S.R. Smith Turbo Twister Slide, S.R. Smith Swim N' Dunk Salt Friendly Challenge Basketball Game, Aquabot Millenium XE robotic cleaner, TF-100 Test Kit and K-1766 Salt Water Test

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    Mr Bruce's Avatar
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    Mar 2014
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    Greenville, SC
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    Re: Algaecide Overdose

    Will the extra algaecide cause any harm? What was in the algaecide? Metals? Ingredient list?
    Do I have to wait to add muriatic acid? No If so, how long?
    How long after adding muriatic acid can I add the CYA (plan to put it in a sock in the skimmer). You can do them at the same time.
    How long after adding CYA can we swim? Immediately
    Does the CYA need to be fully dissolved before we swim? No

    Also your FC is too low for your CYA as it is. I wouldn't add too much more CYA being in NJ.
    32K gallon Plaster - 1hp Hayward 2 speed Super Pump - Hayward S200 Sand Filter - TF100XL
    Test Kits - Pool Math - Chlorine/CYA/Target/Slam Chart

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    Aug 2015
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    Middletown, NJ
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    Re: Algaecide Overdose

    Quote Originally Posted by Mr Bruce View Post
    Will the extra algaecide cause any harm? What was in the algaecide? Metals? Ingredient list?
    Do I have to wait to add muriatic acid? No If so, how long?
    How long after adding muriatic acid can I add the CYA (plan to put it in a sock in the skimmer). You can do them at the same time.
    How long after adding CYA can we swim? Immediately
    Does the CYA need to be fully dissolved before we swim? No

    Also your FC is too low for your CYA as it is. I wouldn't add too much more CYA being in NJ.
    Thanks for your help. I added the muriatic acid but I have not yet added the CYA. Why do you think I shouldn't add CYA? I read that it should be between 60-80 for SWG pools.
    The algaecide is Leslie's Algae Control/Preventer. I can't find a detailed ingredient list online. The bottle says 60% Poly[oxyethylene(dimethyliminio)ethylene(dimethyliminio)ethylene dichloride] and other ingredients 40%. Thanks again.
    20K gal, IG fiberglass installed 8/25/15, Pentair Intelliflo 3 HP variable speed pump, Pentair FNS Plus 48sf DE filter, Pentair Intellichlor IC-40 SWG, Aqua Comfort ACT-1250 Heat Pump, 3 S.R. Smith Pal Treo Lights with WPC1, S.R. Smith Turbo Twister Slide, S.R. Smith Swim N' Dunk Salt Friendly Challenge Basketball Game, Aquabot Millenium XE robotic cleaner, TF-100 Test Kit and K-1766 Salt Water Test

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    Mr Bruce's Avatar
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    Re: Algaecide Overdose

    Sorry, just caught the SWG bit in your signature. Yes, you should be at ~70 when you are using the SWG, but if you are SLAMMING you'd be better off leaving it off until after the SLAM. Even if you aren't slamming 1.5 FC is too low for 30 CYA (round up )

    The algaecide should go away over time, I would pretend it's not there unless you see persistent foaming or metal staining/coloring after a few days of filtering.
    32K gallon Plaster - 1hp Hayward 2 speed Super Pump - Hayward S200 Sand Filter - TF100XL
    Test Kits - Pool Math - Chlorine/CYA/Target/Slam Chart

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    Re: Algaecide Overdose

    Thanks. I usually try to keep chlorine between 3 and 5 which I think should work with CYA at 70. Have a nice evening.
    20K gal, IG fiberglass installed 8/25/15, Pentair Intelliflo 3 HP variable speed pump, Pentair FNS Plus 48sf DE filter, Pentair Intellichlor IC-40 SWG, Aqua Comfort ACT-1250 Heat Pump, 3 S.R. Smith Pal Treo Lights with WPC1, S.R. Smith Turbo Twister Slide, S.R. Smith Swim N' Dunk Salt Friendly Challenge Basketball Game, Aquabot Millenium XE robotic cleaner, TF-100 Test Kit and K-1766 Salt Water Test

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